# process.wait

## Function

Wait for the started child process to exit.

## Syntax

```bt
process(program).child().wait()
```

## Parameters

No parameters.

## Return value

| Type | Description |
| ------ | ------ |
| Int/Empty | Returns the exit code if there is a child process; returns Empty if there is no child process handle. |

## Example

```bt
result = process('cmd').args(['/C', 'exit 0']).child().wait()

// Output: 0
print result
```

## Notes

- This method blocks the current process until the child process exits.